Sains Malaysiana 31: 33-48 (2002)                                                                                                                Sains Bumi /

Earth Science

Kajian Seismik Batuan Sedimen Kumpulan Tembeling

di Km 1.5 Jalan Raya Maran - Lubuk Paku

(Seismic Study on Sedimentary Rock of the Tembaling Group at

Km 1.5 Maran – Lubuk Paku Road)

Umar Hamzah, Kong Kin Yee & Abdul Rahim Samsudin

Pusat Pengajian Sains Sekitaran & Sumber Alam

Faklilti Sains dan Teknologi, Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E., Malaysia

ABSTRAK

Satu kajian geologi untuk mencirikan sifat geofizik batu pasir telah dilakukan di cerun potongan jalan yang terletak di km 1.5 jalan raya Maran - Lubuk Paku. Cerun potongan ini mempunyai tiga teres pada ketinggian 11.5 m, 25 m dan 30 m dari aras jalan raya. Litologi cerun potongan terdiri daripada konglomerat dan batu pasir Kumpulan Tembeling. Kajian ini bertujuan untuk menentukan projil luluhawa batu pasir berdasarkan sistem pengelasan International Association for Engineering Geologist (1981) di samping untuk menentukan sifat-sifat geojizik batuan seperti halaju gelombang P dan S, Modulus Kekenyalan dan Nisbah Poison. Hasil kajian menunjukkan bahan di potongan jalan ini mempunyai gred luluhawa yang sempurna iaitu dari I hingga VI. Daripada kaedah seismos biasan, halaju gelombang P untuk batu pasir berjulat dari 250 - 4000 (m/s), dan halaju gelombang S berjulat dari 75 -1200 (m/s). Halaju sonik gelombang P yang diukur berjulat dari 1350 - 6300 (m/s), dan halaju sonik gelombang S berjulat dari 850 - 3200 (m/s). Pengiraan Modulus Kenyalan pada bahan batuan bergred I, II dan III dilakukan di makmal menunjukkan Modulus Young adalah berjulat dari 5-­71 GPa dan Modulus Ricih berjulat dari 2 - 27 GPa. Manakala Modulus Pukal berjulat dari 3.5 - 70 GPa. Mengikut pengelasan petrografi, batu pasir di kawasan kajian adalah berjenis arenit litik.

ABSTRACT

A geological investigation to characterize the geophysical properties of sandstone has been carried out on a cut slope situated at Km 1.5 Maran ­Lubuk Paku road. The cut slope has 3 major terraces located at 11.5 m, 25 m and 30 m above the main road Level. Lithologically, the slope composed of conglomerate and sandstone of the Tembeling Group. The main purpose of the investigation was to describe the International Association for Engi­neering Geologist (1981) weathering grade and determine geophysical char­acterization of the cut slope earth materials such as the seismic and sonic velocities and the dynamic elastic moduli. Results show that the sandstone has all the weathering grades from I to VI. Seismic survey results show that P-wave velocities range from 250–4000 (m/s), and S-wave velocities is from 75–1200 (m/s). Laboratory sonic tests on the core samples of grade 1 to 111 show that P-wave velocities range from 1350–6343 (m/s) and S-wave velocities range from 862–3187 (m/s). The sonic Young’s moduli of the cores are calculated to be in the range of 4.8- 71 GPa. The Shear Modulus is ranging from 1.9–27 GPa and the Bulk’s Modulus is within the range of 3.5–70 GPa. The saundtone in the study area is petrographically classified as lithic arenite.

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